In this research, surface of hot work tool steel AISI H13
was coated by pack boriding with direct current at temperature
range of 850-950°C for 2-6 hour and distance between anode and
cathode was 1.5 3 and 4.5 cm. The thickness of boride layer
was examined using an optical microscope and image analysis
program. The hardness values of boride layer were measured by
Micro vickers hardness Tester. they were about 1550 HV